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

Only for completeness here additionally the solution for Windows-Forms. We have to override the OnClick method, overriding OnStateChanged results in display bug (and stackoverflow if done incorrectly).

/// 

/// A  with the ability to reverse the checkstate order.
/// 
/// 
public class CheckBoxReversible : CheckBox
{
    private bool FInvertCheckStateOrder;

    /// 

    /// Gets or sets a value indicating whether to invert the check state order from [Indeterminate->Unchecked->Checked] to [Indeterminate->Checked->Unchecked].
    /// 
    /// 
    ///   true to invert the check state order; otherwise, false.
    /// 
    public bool InvertCheckStateOrder
    {
        get { return FInvertCheckStateOrder; }
        set { FInvertCheckStateOrder = value; }
    }

    /// 

    /// Löst das -Ereignis aus.
    /// 
    /// Eine Instanz der -Klasse, die die Ereignisdaten enthält.
    protected override void OnClick(EventArgs e)
    {
        if (this.InvertCheckStateOrder)
        {
            if (this.CheckState == CheckState.Indeterminate)
                this.CheckState = CheckState.Checked;
            else
                if (this.CheckState == CheckState.Checked)
                    this.CheckState = CheckState.Unchecked;
                else
                    if (this.CheckState == CheckState.Unchecked)
                        this.CheckState = this.ThreeState ? CheckState.Indeterminate : CheckState.Checked;
        }
        else
            base.OnClick(e);
    }
}