diff --git a/imgui-binding/src/main/java/imgui/ImGui.java b/imgui-binding/src/main/java/imgui/ImGui.java
index 92717b1..a5779a8 100644
--- a/imgui-binding/src/main/java/imgui/ImGui.java
+++ b/imgui-binding/src/main/java/imgui/ImGui.java
@@ -236,10 +236,18 @@ public final class ImGui {
         return nBegin(title, pOpen.data, 0);
     }
 
+    public static boolean begin(String title, int imGuiWindowFlags) {
+        return nBegin(title, imGuiWindowFlags);
+    }
+
     public static boolean begin(String title, ImBool pOpen, int imGuiWindowFlags) {
         return nBegin(title, pOpen.data, imGuiWindowFlags);
     }
 
+    private static native boolean nBegin(String title, int imGuiWindowFlags); /*
+        return ImGui::Begin(title, NULL, imGuiWindowFlags);
+    */
+
     private static native boolean nBegin(String title, boolean[] pOpen, int imGuiWindowFlags); /*
         return ImGui::Begin(title, &pOpen[0], imGuiWindowFlags);
     */
@@ -3196,7 +3204,7 @@ public final class ImGui {
     }
 
     private static native boolean nCollapsingHeader(String label, boolean[] pOpen, int imGuiTreeNodeFlags); /*
-        return ImGui::CollapsingHeader(label, pOpen, imGuiTreeNodeFlags);
+        return ImGui::CollapsingHeader(label, &pOpen[0], imGuiTreeNodeFlags);
     */
 
     /**
@@ -3627,6 +3635,13 @@ public final class ImGui {
         return nBeginPopupModal(name, pOpen.data, 0);
     }
 
+    /**
+     * Modal dialog (regular window with title bar, block interactions behind the modal window, can't close the modal window by clicking outside)
+     */
+    public static boolean beginPopupModal(String name, int imGuiWindowFlags) {
+        return nBeginPopupModal(name, imGuiWindowFlags);
+    }
+
     /**
      * Modal dialog (regular window with title bar, block interactions behind the modal window, can't close the modal window by clicking outside)
      */
@@ -3634,6 +3649,10 @@ public final class ImGui {
         return nBeginPopupModal(name, pOpen.data, imGuiWindowFlags);
     }
 
+    private static native boolean nBeginPopupModal(String name, int imGuiWindowFlags); /*
+        return ImGui::BeginPopupModal(name, NULL, imGuiWindowFlags);
+    */
+
     private static native boolean nBeginPopupModal(String name, boolean[] pOpen, int imGuiWindowFlags); /*
         return ImGui::BeginPopupModal(name, &pOpen[0], imGuiWindowFlags);
     */
@@ -3801,6 +3820,13 @@ public final class ImGui {
         return nBeginTabItem(label, pOpen.data, 0);
     }
 
+    /**
+     * Create a Tab. Returns true if the Tab is selected.
+     */
+    public static boolean beginTabItem(String label, int imGuiTabBarFlags) {
+        return nBeginTabItem(label, imGuiTabBarFlags);
+    }
+
     /**
      * Create a Tab. Returns true if the Tab is selected.
      */
@@ -3808,6 +3834,10 @@ public final class ImGui {
         return nBeginTabItem(label, pOpen.data, imGuiTabBarFlags);
     }
 
+    private static native boolean nBeginTabItem(String label, int imGuiTabBarFlags); /*
+        return ImGui::BeginTabItem(label, NULL, imGuiTabBarFlags);
+    */
+
     private static native boolean nBeginTabItem(String label, boolean[] pOpen, int imGuiTabBarFlags); /*
         return ImGui::BeginTabItem(label, &pOpen[0], imGuiTabBarFlags);
     */
diff --git a/imgui-lwjgl3/src/test/java/ImGuiGlfwExample.java b/imgui-lwjgl3/src/test/java/ImGuiGlfwExample.java
index 3236504..27f81e2 100644
--- a/imgui-lwjgl3/src/test/java/ImGuiGlfwExample.java
+++ b/imgui-lwjgl3/src/test/java/ImGuiGlfwExample.java
@@ -9,6 +9,7 @@ import imgui.enums.ImGuiConfigFlags;
 import imgui.enums.ImGuiInputTextFlags;
 import imgui.enums.ImGuiKey;
 import imgui.enums.ImGuiMouseCursor;
+import imgui.enums.ImGuiWindowFlags;
 import imgui.gl3.ImGuiImplGl3;
 import org.lwjgl.glfw.GLFWErrorCallback;
 import org.lwjgl.glfw.GLFWVidMode;
@@ -272,7 +273,7 @@ public final class ImGuiGlfwExample {
         ImGui.setNextWindowSize(600, 300, ImGuiCond.Once);
         ImGui.setNextWindowPos(10, 10, ImGuiCond.Once);
 
-        ImGui.begin("Custom window");  // Start Custom window
+        ImGui.begin("Custom window", ImGuiWindowFlags.NoDecoration);  // Start Custom window
         ImGui.text("Hello from Java!");
 
         ImGui.button("Drag me");