GUI.DragWindow() doesnt work - cant figure out why

Window works fine, but I cant drag it. I have tried clicking every where on it, and of course I am not clicking on the buttons. What am I doing wrong? I havent had trouble with this before.

Thanks!

Here I call the window in OnGUI

 void OnGUI()
 {
         //Heads up Display Tool Bar
         GUI.Window(hudWindowID, HudWindowRect, HudWindowFunction, "ToolBar1");
 }

ANd here is the window:

 private void HudWindowFunction(int id)
     {
         GUILayout.BeginHorizontal();
         if(GUILayout.Button ("Ability 1", GUILayout.Width(60), GUILayout.Height(60)))
         {
             //ability 1
         }
         
         if(GUILayout.Button ("Ability 2", GUILayout.Width(60), GUILayout.Height(60)))
         {
             //ability 2
         }
         
         if(GUILayout.Button ("Ability 3", GUILayout.Width(60), GUILayout.Height(60)))
         {
             //ability 3
         }
         
         if(GUILayout.Button ("Ability 4", GUILayout.Width(60), GUILayout.Height(60)))
         {
             //ability 4
         }
         GUILayout.EndHorizontal();
         
         GUI.DragWindow();
     }