TriState Checkbox - how to change the order of the states

Question

I have a CheckBox in my application that is using the TriState mode. The normal behavior for this mode seems to be cycling between null, false, true.

I\'d like to c

Answer 1

Thank you very much, it has been very useful to solve a similar behavior with ToggleButton.

class InvertedToggleButton : ToggleButton
{
    public bool InvertCheckStateOrder
    {
        get { return (bool)GetValue(InvertCheckStateOrderProperty); }
        set { SetValue(InvertCheckStateOrderProperty, value); }
    }

    // Using a DependencyProperty as the backing store for InvertCheckStateOrder.  This enables animation, styling, binding, etc...
    public static readonly DependencyProperty InvertCheckStateOrderProperty = DependencyProperty.Register("InvertCheckStateOrder", typeof(bool), typeof(ToggleButtonInvertido), new UIPropertyMetadata(false));

    protected override void OnToggle()
    {
        if (this.InvertCheckStateOrder)
        {
            if (this.IsChecked == true)
            {
                this.IsChecked = false;
            }
            else if (this.IsChecked == false)
            {
                this.IsChecked = this.IsThreeState ? null : (bool?)true;
            }
            else
            {
                this.IsChecked = true;
            }
        }
        else
        {
            if (!this.IsChecked.HasValue)
                this.IsChecked = true;
            else
                base.OnToggle();
        }
    }
}