void SetEdgePaint(EdgePaint paint)
 {
     edgePaint = edgePaint == paint ? EdgePaint.OFF : paint;
     cellPaint = CellPaint.OFF;
     _editMode = EditMode.OFF;
     UpdatePaintText();
     UpdateButtons();
 }
 void SetCellPaint(CellPaint paint)
 {
     cellPaint = cellPaint == paint ? CellPaint.OFF : paint;
     edgePaint = EdgePaint.OFF;
     _editMode = EditMode.OFF;
     UpdatePaintText();
     UpdateButtons();
 }
 void SetEditMode(EditMode value)
 {
     _editMode = _editMode == value ? EditMode.OFF : value;
     edgePaint = EdgePaint.OFF;
     cellPaint = CellPaint.OFF;
     UpdateButtons();
     UpdatePaintText();
 }