ComboBox selected Index and default value

ComboBox selected Index and default value

  
Hi,
I'm using two comboboxes. When I choose one item form the first, the second will be loaded with the information relative to the first.
This is working, but I can´t get the first Combobox to maintain the index chosen. Is this possible? If so, how?
And is there any way to have a default input like "select one option"?
Hope that you can understand my problem,
Thank's
Francisco Neto
set the properties of combo box,

options1 = All (u can write ur choice here)
value1 = 0
option2 = etc....
hope it will help...