C# 选择组合框文本时，将光标更改为方形

我在WPF中有一个可编辑的组合框，它的工作方式是，若文本被选中（高亮显示），光标应该变成十字，这样用户就可以知道他可以将文本移动到另一个组合框中，若用户尝试编辑，光标应该是编辑光标

下面是我正在尝试的代码，关于焦点事件

   private void LocationComboBox_GotFocus(object sender, RoutedEventArgs e)
    {
        ComboBox combo = (System.Windows.Controls.ComboBox)sender;
        var edit = (TextBox)combo.Template.FindName("PART_EditableTextBox", combo);

       var selectedText = edit.SelectedText;

       if (!string.IsNullOrEmpty(selectedText))
        {
            Cursor = Cursors.Cross;
        }
        else
        {
            Cursor = Cursors.Arrow;
        }
}

这是屏幕截图

在快照中，由于德克萨斯州奥斯汀高亮显示，我的光标应该是十字

提前谢谢你

使用以下代码：

private void cmb_Loaded(object sender, RoutedEventArgs e)
    {
        TextBox TxtBox = (TextBox)cmb.Template.FindName("PART_EditableTextBox", cmb);
        if (TxtBox != null)
        {
            TxtBox.SelectionChanged += TxtBox_SelectionChanged;
        }
    }

    void TxtBox_SelectionChanged(object sender, RoutedEventArgs e)
    {
        var TxtBox = sender as TextBox;
        if (TxtBox != null && !string.IsNullOrEmpty(TxtBox.SelectedText))
        {
            Mouse.OverrideCursor = Cursors.Cross;
        }
        else
        {
            Mouse.OverrideCursor = Cursors.Arrow;
        }
    }

使用以下代码：

private void cmb_Loaded(object sender, RoutedEventArgs e)
    {
        TextBox TxtBox = (TextBox)cmb.Template.FindName("PART_EditableTextBox", cmb);
        if (TxtBox != null)
        {
            TxtBox.SelectionChanged += TxtBox_SelectionChanged;
        }
    }

    void TxtBox_SelectionChanged(object sender, RoutedEventArgs e)
    {
        var TxtBox = sender as TextBox;
        if (TxtBox != null && !string.IsNullOrEmpty(TxtBox.SelectedText))
        {
            Mouse.OverrideCursor = Cursors.Cross;
        }
        else
        {
            Mouse.OverrideCursor = Cursors.Arrow;
        }
    }