Return true if this window is a control capable of receiving the focus.
Reimplemented in FX::FXArrowButton, FX::FXBitmapView, FX::FXButton, FX::FXCanvas, FX::FXCheckButton, FX::FXColorWell, FX::FXDial, FX::FXDockHandler, FX::FXFoldingList, FX::FXIconList, FX::FXImageView, FX::FXKnob, FX::FXList, FX::FXMDIChild, FX::FXMenuButton, FX::FXMenuCascade, FX::FXMenuCommand, FX::FXMenuTitle, FX::FXOption, FX::FXOptionMenu, FX::FXRadioButton, FX::FXRealSlider, FX::FXSlider, FX::FXTabItem, FX::FXTable, FX::FXText, FX::FXTextField, FX::FXToggleButton, FX::FXToolBarGrip, FX::FXToolBarTab, and FX::FXTreeList.
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