private void ApplyState(HistoryState state)
{
gridWidth = state.GridWidth;
gridHeight = state.GridHeight;
Pixels.Reset(state.GetGridClone());
OnPropertyChanged("GridHeight");
OnPropertyChanged("GridWidth");
OnPropertyChanged("PixelWidth");
OnPropertyChanged("Pixels");
OnPropertyChanged("UndoAction");
OnPropertyChanged("RedoAction");
OnPropertyChanged("CanUndo");
OnPropertyChanged("CanRedo");
}