Indicates whether the add/remove item is visible in the menu of the customize dialog.
function IsActionVisible: Boolean;
__fastcall Boolean IsActionVisible();
IsActionVisible returns true if the Add/Remove item is currently visible in the menu of the customize dialog. The menu can automatically hide items that have not been used recently.
IsActionVisible locates the action client object that corresponds to this menu item, if any. If this menu item has a corresponding action client in the action manager, IsActionVisible returns the value of that object's Visible property. If this menu item does not have a corresponding action client, IsActionVisible returns false.
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