When using a CompareValidator control with the CalendarExtender, if you enter an invalid date and the CompareValidator shows the error message the CalendarExtender popup calendar will not stay shown it displays for a second and then hides again.
To reproduce:
Add a TextBox, CalendarExtender and CompareValidator on a test page and then load page and enter invalid date and then click on the calender icon.
To reproduce:
Add a TextBox, CalendarExtender and CompareValidator on a test page and then load page and enter invalid date and then click on the calender icon.