hello, in my app i want to use TabActivity ,suppose it have two tabs(tab1 and tab2) one have activity1(or View1),the other have activity2(View2),then i want to use menu,when i press item "tab3" ,the content of tab1 chang activity3(or View3), when i press item(tab4)of menu,the content of tab2 chang activity4(or View4).how to achieve these change instead of make four tabs or How can I switch the activity of the content of a tab in Tabhost