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Set not permitted
You attempted to change a property whose settings either cannot be set at run time or else can only be set under certain conditions. For example, you may have tried to change the Appearance, ControlBox, MinButton, or MaxButton property settings for the form at run time, or you may have tried to set the Visible property to False for the last remaining visible submenu on a parent menu.
To correct this error
Check the property and determine under what conditions it can be set.