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FormHelp component as subproperty of WhatsThis structure.
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property ToolbarButton: TControl;
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The ToolbarButton property points to the "What's This?" button on the toolbar (or any control, in general). When user clicks this button, the cursor will be changed to a question mark with a pointer.
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If the user then clicks a control in the form, the control receives a WM_HELP message. The FormHelp component hooks this message to show the context-sensitive help taken from secondary part of the Hint property.
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MenuItem property and InvokeHelpPointer method.
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