Hi ERobishaw,
Thanks for using Syncfusion products.
If your intention is to remain the PopUp to be open when we click or select the control while closing the PopUp, you can do as follows.
private void dropDown_BeforeCloseup(object sender, CancelEventArgs arg)
{
if (MessageBox.Show("Close the dropdown list?", "Check",
MessageBoxButtons.YesNo)==DialogResult.No)
arg.Cancel = true;
}
Please refer the sample in the below link that illustrates the above.
http://websamples.syncfusion.com/samples/Tools.Windows/F72754/main.htm
Please provide me more details if I misunderstood your requirement.
Regards,
Asem.