diff --git a/example/main.js b/example/main.js
index e09c16b..183c069 100644
--- a/example/main.js
+++ b/example/main.js
@@ -33,6 +33,36 @@
     let clear_color = new imgui_2.ImVec4(0.45, 0.55, 0.60, 1.00);
     /* static */ let f = 0.0;
     const memory_editor = new imgui_memory_editor_1.MemoryEditor();
+    let source = [
+        "ImGui.Text(\"Hello, world!\");",
+        "ImGui.SliderFloat(\"float\",",
+        "\t(value = f) => f = value,",
+        "\t0.0, 1.0);",
+        ""
+    ].join("\n");
+    function ShowSandboxWindow(title, p_open = null) {
+        ImGui.Begin(title, p_open, 64 /* AlwaysAutoResize */);
+        ImGui.InputTextMultiline("##source", (_ = source) => (source = _), 1024, imgui_1.ImVec2.ZERO, 1024 /* AllowTabInput */);
+        ImGui.SameLine();
+        ImGui.TextDisabled("(?)");
+        if (ImGui.IsItemHovered()) {
+            ImGui.BeginTooltip();
+            ImGui.PushTextWrapPos(450.0);
+            ImGui.TextUnformatted("Contents evaluated and appended to the window.");
+            ImGui.PopTextWrapPos();
+            ImGui.EndTooltip();
+        }
+        try {
+            eval(source);
+        }
+        catch (e) {
+            ImGui.TextColored(new imgui_2.ImVec4(1.0, 0.0, 0.0, 1.0), "error: ");
+            ImGui.SameLine();
+            ImGui.Text(e.message);
+        }
+        ImGui.End();
+    }
+    let show_sandbox_window = false;
     // Main loop
     let done = false;
     function _loop(time) {
@@ -68,6 +98,10 @@
             ImGui.Text(`Total allocated space (uordblks):      ${mi.uordblks}`);
             ImGui.Text(`Total free space (fordblks):           ${mi.fordblks}`);
             // ImGui.Text(`Topmost releasable block (keepcost):   ${mi.keepcost}`);
+            if (ImGui.Button("Sandbox Window"))
+                show_sandbox_window = !show_sandbox_window;
+            if (show_sandbox_window)
+                ShowSandboxWindow("Sandbox Window", (value = show_sandbox_window) => show_sandbox_window = value);
         }
         // 2. Show another simple window. In most cases you will use an explicit Begin/End pair to name the window.
         if (show_another_window) {
@@ -105,4 +139,4 @@
     }
 }
 exports.default = main;
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\ No newline at end of file
+//# sourceMappingURL=data:application/json;base64,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
\ No newline at end of file

diff --git a/example/main.js b/example/main.js
index e09c16b..183c069 100644
--- a/example/main.js
+++ b/example/main.js
@@ -33,6 +33,36 @@
     let clear_color = new imgui_2.ImVec4(0.45, 0.55, 0.60, 1.00);
     /* static */ let f = 0.0;
     const memory_editor = new imgui_memory_editor_1.MemoryEditor();
+    let source = [
+        "ImGui.Text(\"Hello, world!\");",
+        "ImGui.SliderFloat(\"float\",",
+        "\t(value = f) => f = value,",
+        "\t0.0, 1.0);",
+        ""
+    ].join("\n");
+    function ShowSandboxWindow(title, p_open = null) {
+        ImGui.Begin(title, p_open, 64 /* AlwaysAutoResize */);
+        ImGui.InputTextMultiline("##source", (_ = source) => (source = _), 1024, imgui_1.ImVec2.ZERO, 1024 /* AllowTabInput */);
+        ImGui.SameLine();
+        ImGui.TextDisabled("(?)");
+        if (ImGui.IsItemHovered()) {
+            ImGui.BeginTooltip();
+            ImGui.PushTextWrapPos(450.0);
+            ImGui.TextUnformatted("Contents evaluated and appended to the window.");
+            ImGui.PopTextWrapPos();
+            ImGui.EndTooltip();
+        }
+        try {
+            eval(source);
+        }
+        catch (e) {
+            ImGui.TextColored(new imgui_2.ImVec4(1.0, 0.0, 0.0, 1.0), "error: ");
+            ImGui.SameLine();
+            ImGui.Text(e.message);
+        }
+        ImGui.End();
+    }
+    let show_sandbox_window = false;
     // Main loop
     let done = false;
     function _loop(time) {
@@ -68,6 +98,10 @@
             ImGui.Text(`Total allocated space (uordblks):      ${mi.uordblks}`);
             ImGui.Text(`Total free space (fordblks):           ${mi.fordblks}`);
             // ImGui.Text(`Topmost releasable block (keepcost):   ${mi.keepcost}`);
+            if (ImGui.Button("Sandbox Window"))
+                show_sandbox_window = !show_sandbox_window;
+            if (show_sandbox_window)
+                ShowSandboxWindow("Sandbox Window", (value = show_sandbox_window) => show_sandbox_window = value);
         }
         // 2. Show another simple window. In most cases you will use an explicit Begin/End pair to name the window.
         if (show_another_window) {
@@ -105,4 +139,4 @@
     }
 }
 exports.default = main;
-//# sourceMappingURL=data:application/json;base64,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
\ No newline at end of file
+//# sourceMappingURL=data:application/json;base64,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
\ No newline at end of file
diff --git a/example/main.ts b/example/main.ts
index d143e04..61c806f 100644
--- a/example/main.ts
+++ b/example/main.ts
@@ -39,6 +39,39 @@
     
     const memory_editor: MemoryEditor = new MemoryEditor();
 
+    let source: string = [
+        "ImGui.Text(\"Hello, world!\");",
+        "ImGui.SliderFloat(\"float\",",
+        "\t(value = f) => f = value,",
+        "\t0.0, 1.0);",
+        ""
+    ].join("\n");
+
+    function ShowSandboxWindow(title: string, p_open: ImGui.ImAccess<boolean> | null = null): void {
+        ImGui.Begin(title, p_open, ImGui.WindowFlags.AlwaysAutoResize);
+        ImGui.InputTextMultiline("##source", (_ = source) => (source = _), 1024, ImVec2.ZERO, ImGui.InputTextFlags.AllowTabInput);
+        ImGui.SameLine();
+        ImGui.TextDisabled("(?)");
+        if (ImGui.IsItemHovered())
+        {
+            ImGui.BeginTooltip();
+            ImGui.PushTextWrapPos(450.0);
+            ImGui.TextUnformatted("Contents evaluated and appended to the window.");
+            ImGui.PopTextWrapPos();
+            ImGui.EndTooltip();
+        }
+        try {
+            eval(source);
+        } catch (e) {
+            ImGui.TextColored(new ImVec4(1.0,0.0,0.0,1.0), "error: ");
+            ImGui.SameLine();
+            ImGui.Text(e.message);
+        }
+        ImGui.End();
+    }
+
+    let show_sandbox_window: boolean = false;
+
     // Main loop
     let done: boolean = false;
     function _loop(time: number): void {
@@ -76,6 +109,10 @@
             ImGui.Text(`Total allocated space (uordblks):      ${mi.uordblks}`);
             ImGui.Text(`Total free space (fordblks):           ${mi.fordblks}`);
             // ImGui.Text(`Topmost releasable block (keepcost):   ${mi.keepcost}`);
+            if (ImGui.Button("Sandbox Window"))
+                show_sandbox_window = !show_sandbox_window;
+            if (show_sandbox_window)
+                ShowSandboxWindow("Sandbox Window", (value = show_sandbox_window) => show_sandbox_window = value);
         }
     
         // 2. Show another simple window. In most cases you will use an explicit Begin/End pair to name the window.