Click event not fired in frist click

Hi all,
On a mastrer page I've the following.


<asp:LinkButton ID="lbItem1" runat="server"                                                               PostBackUrl="~/view.aspx" OnClick="lbViewAll_Click">View All</asp:LinkButton>


But the function is not kickoff in first click of the link text,, only in second time click it works. Can anyone tell me why it's happen.


Thanks

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