How to Skip a Control in Keyboard Navigation

Question

Im using some controls like text box,buttons...etc in a wpf page
all these controls are in a grid and im using KeyboardNavigation.TabNavigation="Cycle" for that grid...
and its working fine....

now in that i dont want the tab to go on a certain control...means i would like to skip a tab in this cycle and move to another control

to explain : suppose im having 4 controls..
when i tab it goes to 1,2,3,4....
but i would like to skip 3 and go directly to 4 from 2

hope u understood....can anyone help me....