如何在下拉的Onchange事件上将焦点设置为文本框？

I have textbox whose visibility is controlled by value selected in telerik dropdown. Say if value selected is yes then textbox is visible else it hides. Now when value in dropdown set to Yes i am not able to set focus to that textbox. Only on pressing 'Tab' key focus moves over there but not as soon as textbox appears. I have tried this code:I have textbox whose visibility is controlled b