How to access the controls

Hi,
i am having textblock called now i am binding the data to datagrid from database. in my database i am having values 1 and 2 for above textblock . now my requirement is how to access the value of the textblock and if the value is 1 i have to dispaly stackpanel called "radio" and the value is 2 i have to hide stackpanel radio and have to display the stackpanel called "checkbox". how can i achieve this one . for this in which event i have to writhe the code . can anybody please help me .

Thanks
p.Nagaraju