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[ASPx]
<dxe:ASPxButton ID="ASPxButton2" runat="server" AutoPostBack="False" Text="Select predefined price">
<ClientSideEvents Click="function(s, e) { popup.Show(); }" />
</dxe:ASPxButton>
...
<dx:ASPxPopupControl ID="ASPxPopupControl1" runat="server" ClientInstanceName="popup" Height="87px" Width="156px"
AllowDragging="true" PopupHorizontalAlign="WindowCenter" PopupVerticalAlign="WindowCenter" HeaderText="Predefined price">
<ContentCollection>
<dx:PopupControlContentControl runat="server">
<dxe:ASPxLabel ID="ASPxLabel2" runat="server" Text="Select price:" />
<dxe:ASPxListBox ID="ASPxListBox1" runat="server" ClientInstanceName="listBox">
<Items>
<dxe:ListEditItem Text="10" Value="10" />
<dxe:ListEditItem Text="20" Value="20" />
<dxe:ListEditItem Text="30" Value="30" />
</Items>
</dxe:ASPxListBox>
<dxe:ASPxButton ID="ASPxButton1" runat="server" AutoPostBack="False" Text="Apply">
<ClientSideEvents Click="function(s, e) {
popup.Hide();
tbField1.SetText(listBox.GetSelectedItem().value);
}" />
</dxe:ASPxButton>
</dx:PopupControlContentControl>
</ContentCollection>
</dx:ASPxPopupControl>