Problem with CalendarExtender controll position

Question

Hi,

 

I am getting prroblem with position of   CalendarExtender.

 

after the page loads and when i click on the text box, the CalendarExtender is being displayed on the top left part of the page.

 

After i click on the text page for second time it is displyed at the right bottom side of the text page.

 

 

After clicking on the textbox for the first time i am having problem wit the location of  CalendarExtender.