Return default height.
Reimplemented from FX::FXFrame. Reimplemented in FX::FXCheckButton, FX::FXMDIDeleteButton, FX::FXMDIRestoreButton, FX::FXMDIMaximizeButton, FX::FXMDIMinimizeButton, FX::FXMDIWindowButton, FX::FXMenuButton, FX::FXOption, FX::FXOptionMenu, FX::FXRadioButton, FX::FXToggleButton, and FX::FXTriStateButton.
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