void Close_Executed(object sender, ExecutedRoutedEventArgs e)
{
if (CloseVMCommand != null && CloseVMCommand.CanExecute(null))
{
CloseVMCommand.Execute(null);
}
}
private void Close_CanExecute(object sender, CanExecuteRoutedEventArgs e)
{
e.CanExecute = CloseVMCommand != null && CloseVMCommand.CanExecute(null);
}