Panel Controls in Vb.net

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VB

forms

controls

Hi Guys,
I am facing a issue. I have a main from in that so many tab controls and panel controls are there, in that all tab controls having different forms are there.In that all of the tab controls having last update id and update time is there. Now of one the control having combo box(drop down box) if i changed the value in drop down list then the data is changing according to that but update id and update are not changing display old update id and update time if i goes next tab or previous tab then only its showing correctly.

My Question is if i change is the value in drop down box then automatically update id and update should change. This update and update date is displaying inthe panel which is related to main from.
Please help me on this

Thanks And Regards
Kanthi Kumar