diff --git a/comp/src/gb.form.mdi/.icon.png b/comp/src/gb.form.mdi/.icon.png
index 9f37aa800..1739b407c 100644
Binary files a/comp/src/gb.form.mdi/.icon.png and b/comp/src/gb.form.mdi/.icon.png differ
diff --git a/comp/src/gb.form.mdi/.project b/comp/src/gb.form.mdi/.project
index 0c8b9fe60..bbac744a8 100644
--- a/comp/src/gb.form.mdi/.project
+++ b/comp/src/gb.form.mdi/.project
@@ -1,6 +1,6 @@
 # Gambas Project File 3.0
 Title=Multiple document interface management
-Startup=Form3
+Startup=FTestBackground
 Icon=.hidden/control/workspace.png
 Version=3.15.90
 VersionFile=1
@@ -9,7 +9,7 @@ Component=gb.gui
 Component=gb.form
 Component=gb.settings
 Authors="Benoît Minisini"
-Environment="GB_GUI=gb.gtk3"
+Environment="GB_GUI=gb.gtk3\nGTK_DEBUG=interactive"
 TabSize=2
 Translate=1
 Language=en
diff --git a/comp/src/gb.form.mdi/.src/ToolBar/ToolBar.class b/comp/src/gb.form.mdi/.src/ToolBar/ToolBar.class
index be24c0bcb..e621f269f 100644
--- a/comp/src/gb.form.mdi/.src/ToolBar/ToolBar.class
+++ b/comp/src/gb.form.mdi/.src/ToolBar/ToolBar.class
@@ -7,6 +7,7 @@ Inherits UserContainer
 Public Const _Properties As String = "*,-Arrangement,-Padding,-Spacing,-Indent,-Invert,Key,Text,Action,Orientation{ToolBar.Horizontal;Vertical},Size{Tiny;Small;Medium;Large;Huge}=Small,AutoResize=True,Separator"
 Public Const _DefaultArrangement As String = "R"
 Public Const _DefaultSize As String = "36,4"
+Public Const _Similar As String = "Panel"
 
 Public Enum Horizontal, Vertical