01.
<dx:ASPxComboBox ID=
"cb_ItemLists"
ClientInstanceName=
"cb_ItemLists"
runat=
"server"
ValueType=
"System.String"
>
02.
<ClientSideEvents
03.
Init=
"function(s,e){s.SetSelectedIndex(-1);}"
04.
SelectedIndexChanged=
"function(s,e){bt_search.SetEnabled(s.GetValue() != null);}"
05.
/>
06.
</dx:ASPxComboBox>
07.
<dx:ASPxButton ID=
"bt_search"
ClientInstanceName=
"bt_search"
runat=
"server"
Text=
"Search"
AutoPostBack=
"false"
>
08.
<ClientSideEvents
09.
Init=
"function(s,e){s.SetEnabled(false);}"
10.
/>
11.
</dx:ASPxButton>