Correct GameCreationWindow height for undefined size (CnCNet#772)

Author: SadPencil

DXMainClient/DXGUI/Multiplayer/CnCNet/GameCreationWindow.cs

@@ -181,10 +181,10 @@ public override void Initialize()
                 AddChild(btnLoadMPGame);
             AddChild(btnCancel);
 
-            base.Initialize();
-
             Height = btnCreateGame.Bottom + UIDesignConstants.CONTROL_VERTICAL_MARGIN + UIDesignConstants.EMPTY_SPACE_BOTTOM;
 
+            base.Initialize();
+
             CenterOnParent();
 
             UserINISettings.Instance.SettingsSaved += Instance_SettingsSaved;