Question

I want to add a DependencyObject to a control from code behind. I have searched and searched online for how to do this with absolutely no success. The DependencyObject has a DependencyProperty. I also want to set this property from code-behind.

charting:ChartBehaviors inherits directly from DependencyObject. It is a class I wrote myself. The Chart control is a Third-party control.

charting:ChartBehaviors.FloatingTooltip is the DependencyProperty. This is also a class I wrote myself.

Here is what it looks like in XAML. I want to do this in code behind so that I can turn on and off the “behavior”.

<charting:Chart>
   <charting:ChartBehaviors.FloatingTooltip>
      <charting:FloatingTooltipBehavior
         TooltipTemplate="{StaticResource tooltipTemplate}" />
  </charting:ChartBehaviors.FloatingTooltip>
</charting:Chart>

Answer 1

You can just use the SetValue method on the object (assuming you give your chart an id of chart1).

var behave = new FloatingTooltipBehavior();
chart1.SetValue(ChartBehaviors.FloatingTooltipProperty, behave);

Another solution would be to just add an Enabled property to your behavior and then set that from the code behind.