diff --git a/src/imgui_impl.ts b/src/imgui_impl.ts
index 623d4a7..6189ac4 100644
--- a/src/imgui_impl.ts
+++ b/src/imgui_impl.ts
@@ -203,20 +203,16 @@
     {
         super();
 
-        if (isFirstWindow)
-        {
-            this.ctx = contexts[0];
-            this.io = contextIOs[0];
-        }
-        else
-        {
-            this.ctx = ImGui.CreateContext(contextIOs[0].Fonts);
-            ImGui.SetCurrentContext(this.ctx);
-            this.io = ImGui.GetIO();
-        }
+        this.ctx = ImGui.CreateContext(contextIOs.length == 0 ? null : contextIOs[0].Fonts);
+        ImGui.SetCurrentContext(this.ctx);
+        this.io = ImGui.GetIO();
 
+        contexts.push(this.ctx);
+        contextIOs.push(this.io);
 
-        isFirstWindow = false;
+        if (typeof(window) !== "undefined") {
+            ImGui.LoadIniSettingsFromMemory(window.localStorage.getItem("imgui.ini") || "");
+        }
 
         if (typeof(navigator) !== "undefined") {
             this.io.ConfigMacOSXBehaviors = navigator.platform.match(/Mac/) !== null;
@@ -271,7 +267,6 @@
         this.io.KeyMap[ImGui.Key.Y] = 89;
         this.io.KeyMap[ImGui.Key.Z] = 90;
 
-        contextIOs.push(this.io);
         this.update = update;
         this.resize(sizeX, sizeY);
         this.imgui.pluginName = 'imgui_renderer';
@@ -280,6 +275,11 @@
         app.renderer.plugins.interaction.addListener("mouseup", this.mouseUp.bind(this));
         app.ticker.add(this.updateInternal.bind(this));
     }
+    withContext(cb: () => void)
+    {
+        ImGui.SetCurrentContext(this.ctx);
+        cb();
+    }
     mouseDown(e: PIXI.interaction.InteractionEvent): void
     {
         this.io.MouseDown[mouse_button_map[0]] = true;
@@ -482,8 +482,6 @@
 let g_ElementsHandle: WebGLBuffer | null = null;
 let g_FontTexture: WebGLTexture | null = null;
 
-let prev_time: number = 0;
-
 function document_on_copy(event: ClipboardEvent): void {
     if (event.clipboardData) {
         event.clipboardData.setData("text/plain", clipboard_text);
@@ -620,16 +618,6 @@
 export function Init(_app: PIXI.Application): void {
     // Setup Dear ImGui binding
     ImGui.IMGUI_CHECKVERSION();
-    ImGui.CreateContext();
-
-    contexts.push(ImGui.GetCurrentContext());
-    contextIOs.push(ImGui.GetIO());
-    contextIOs[0].Fonts.AddFontDefault();
-
-
-    if (typeof(window) !== "undefined") {
-        ImGui.LoadIniSettingsFromMemory(window.localStorage.getItem("imgui.ini") || "");
-    }
 
     if (typeof(document) !== "undefined") {
         document.body.addEventListener("copy", document_on_copy);
@@ -642,7 +630,6 @@
         window.addEventListener("gamepaddisconnected", window_on_gamepaddisconnected);
     }
 
-
     app = _app;
     gl = (app.renderer as any).gl;
     canvas = app.view;