Multiple web controls to trigger one Update Panel

Question

I have three web controls that has to update a gridview inside an updatepanel.

The markup is like this:

<asp:DropDown></asp:DropDown>
<asp:Button></asp:Button>
<asp:DropDown></asp:DropDown>
<asp:UpdatePanel>
<asp:Gridview></asp:Gridview>
</asp:UpdatePanel>

I cannot put the updatepanel before the first dropdown because I have used the bootstrap datepicker and that does not behave properly if I put the updatepanel in the start.