[Overview][Constants][Types][Classes][Procedures and functions][Variables][Index] | Reference for unit 'Dialogs' (#lcl)

# TCustomTaskDialog.DoOnHelp

Signals the OnHelp event handler (when assigned).

## Declaration

Source position: dialogs.pp line 785

`protected procedure TCustomTaskDialog.DoOnHelp; dynamic;`

## Description

DoOnHelp is a method called to perform actions needed when the Help command is executed for the task dialog. It signals the OnHelp event handler (when assigned) to respond to the help request.

DoOnHelp is called when the widgetset handles a TDN_HELP task dialog notification message which occurs when the Help button is clicked. For platforms where an emulated task dialog form is used, it is called from the KeyDown method in the TLCLTaskDialog instance when the F1 key is pressed.

## Version info

Added in LCL version 4.0.

## See also

TCustomTaskDialog.OnHelp |  | Event handler signalled to display help for the task dialog.
TCustomTaskDialog.Buttons |  | Collection with the buttons for the Task dialog.
TLCLTaskDialog.KeyDown |  | Implements the OnKeyDown event handler for the task dialog.