How do I make my tooltip The active window(appear above all other windows)

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the tooltip in the back i want displayed as the active windows(the window shown in front).
the tooltip is displayed from the 3rd icon on the bottom right

Following the same tutorial, just set GUI.Depth = 0 in the DisplayToolTip() function.

private void DisplayToolTip(){
		if(_toolTip != ""){
			GUI.Box(new Rect(Input.mousePosition.x, Screen.height - Input.mousePosition.y, 200, 100), _toolTip);
			GUI.depth = 0;
		}