Not able to refresh the tree list

Hi all, I'm facing one issue in devexpress tree list, I have XtraTab control along with tree list so when I click on each tab I will bind different data to the tree list so, when I click on Tab2 automatically data source will change but it's not effecting at UI side, can anyone suggest me how I can do this. I used "RefreshDataSource" method but it's not refreshing the data

 

Note: This issue I'm facing in word VSTO task pane