Trackball leaves stuff on the screen when disabled

[scott]

Hi.  I have a trackball setup on a chart.

chart.Controllers.Add(new ChartTrackballController());
chart.ShowTrackBall = false;

I have a click handler that toggles the trackball. 

private void chart_MouseClick(object sender, MouseEventArgs e)
{
    if (e.Button == System.Windows.Forms.MouseButtons.Right)
    {
        chart.ShowTrackBall = !chart.ShowTrackBall;
    }
}

When I disable the trackball it leaves its message box on the screen...  If I toggle the trackball a bunch of times, I end up with a bunch of message boxes on the screen... 

See the pix for a sample.

Thoughts? -
Thanks

[Ivan Petrov]

Hello Scott,

Thank you for writing.

I was able to reproduce the issue and have logged it in our Public Issue Tracking System - PITS. You can track its progress, subscribe for status changes and add your vote/comment on the following link - PITS Issue. 
To workaround this issue you can create a custom trackball controller deriving from the default one. In the custom controller you should override the ControllerRemoved method. Your code might look like this:

public class MyTrackballController : ChartTrackballController
{
    protected override void ControllerRemoved()
    {
        base.ControllerRemoved();

        ChartView view = this.Area.Parent as ChartView;
        ChartWrapper chartWrapper = view.Owner as ChartWrapper;

        if (chartWrapper.Children.Contains(this.Element))
        {
            chartWrapper.Children.Remove(this.Element);
        }
    }
}

You will also have to modify your click event handler to use your custom controller:

private void radChartView1_MouseClick(object sender, MouseEventArgs e)
{
    if (e.Button == System.Windows.Forms.MouseButtons.Right)
    {
        if (this.radChartView1.ShowTrackBall)
        {
            this.radChartView1.ShowTrackBall = false;
        }
        else
        {
            this.radChartView1.Controllers.Add(new MyTrackballController());
        }
    }
}

I have also updated your Telerik points for bringing this issue to our attention.

I hope this will help. Feel free to write back with any further questions.

Kind regards,
Ivan Petrov
the Telerik team