Refresh Activity inside Tab Activity

Question

I created some activity(say A, B and C) under TabActivity and use m_tabHost.setCurrentTab(n); to launch appropriate Activity. Here I activity(say A) get launch as per behaviour on-click of define tab(say TAB A). Now how can reload same activity on click of same tab. How can get access of same tab to reload same open activity.

Any one have suggestion/idea?