在后台代码中设定控件的Visibility

在不同情况下，显示不同的控件。

Case1：ToggleButton显示，Grid的Visibility通过ToggleButton的IsChecked属性绑定；

Case2：ToggleButton隐藏，Grid显示。

通过类型判断进入处理部分：

public HelloWindow(WinType type)
{
    winType = type;

    InitializeComponent();

    if (winType == WinType.Case1)
    {
        myToggleButton.Visibility = System.Windows.Visibility.Collapsed;
        myGrid.Visibility = System.Windows.Visibility.Visible;
    }
    else if (winType == WinType.Case2)
    {
        myToggleButton.Visibility = System.Windows.Visibility.Visible;
        Binding binding = new Binding()
        {
            ElementName = "myToggleButton",
            Path = new PropertyPath("IsChecked"),
            Converter = (BooleanToVisibilityConverter)this.FindResource("b2v"),
            Mode = BindingMode.OneWay
        };
        myGrid.SetBinding(Grid.VisibilityProperty, binding);
        // 或者使用静态方法
        // BindingOperations.SetBinding(myGrid, Grid.WidthProperty, binding);
    }
}

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