Use 'override' for all virtual member functions.

Applications/DataExplorer/Base/CheckboxDelegate.h

Applications/DataExplorer/Base/ColorPickerPushButton.h

...ications/DataExplorer/Base/QNonScalableGraphicsTextItem.h

Applications/DataExplorer/Base/RecentFiles.h

Applications/DataExplorer/Base/StrictDoubleValidator.h

Applications/DataExplorer/Base/StrictIntValidator.h

Applications/DataExplorer/Base/TreeModel.h

Applications/DataExplorer/DataView/AddLayerToMeshDialog.h

Applications/DataExplorer/DataView/ColorTableModel.h

Applications/DataExplorer/DataView/ColorTableView.h

Applications/DataExplorer/DataView/CondFromRasterDialog.h

...ations/DataExplorer/DataView/CreateStructuredGridDialog.h

...ations/DataExplorer/DataView/DataExplorerSettingsDialog.h

...ications/DataExplorer/DataView/DiagramView/DetailWindow.h

...ns/DataExplorer/DataView/DiagramView/DiagramPrefsDialog.h

...ications/DataExplorer/DataView/DiagramView/DiagramScene.h

Applications/DataExplorer/DataView/DiagramView/DiagramView.h

Applications/DataExplorer/DataView/DiagramView/QArrow.h

...cations/DataExplorer/DataView/DiagramView/QGraphicsGrid.h

Applications/DataExplorer/DataView/ElementTreeModel.h