private void CreateCommands()
{
LineCommand = new RelayCommand(() =>
{
Canvas.InstallTool(new LineTool(), (tool) => LineCommand.RaiseCanExecuteChanged());
}, () => Canvas.ActiveTool == null);
PolylineCommand = new RelayCommand(() =>
{
Canvas.InstallTool(new PolylineTool(), (tool) => CommandManager.InvalidateRequerySuggested() /*PolylineCommand.RaiseCanExecuteChanged()*/);
}, () => Canvas.ActiveTool == null);
ToggleGridSnapCommand = new RelayCommand(EnableGridSnapCommandExecute);
ToggleElementSnapCommand = new RelayCommand(EnableElementSnapCommandExecute);
DeleteCommand = new RelayCommand(() =>
{
Canvas.RemoveSelected();
}, () => Canvas.Selection.All.Any());
EnablePanModeCommand = new RelayCommand(EnablePanModeCommandExecute);
}