Even better, EasyListBox comes with prepackaged client buttons that will clear your selections, or select all options; you
never have to touch client-side code.
Action Buttons can be actual buttons, images, or straight HTML links.
<ELB:ActionButton TargetList="multiSelect"
Action="selectall" Text="Select All" runat="server" />
<ELB:ActionButton TargetList="multiSelect"
DisplayType="Link"
Action="clearall" Text="Unselect All" runat="server" />
<ELB:ActionButton TargetList="multiSelect"
DisplayType="Image" ImageURL="images/flags/usa.gif"
Action="selectall" Text="Select All" runat="server" />
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