CapLite as workgroup bridge (IAPP?)

Hello,
im beginer in mt, but i want to use CAP as wourkgroup brige WGB. Now we have in our office CISCO APs and if i set CAP like CPE everthink works, but CAP is still connect only to the one AP, and dont reconnect to the better AP. Any idea how it do better? My colleague from cisco network told me it doesnt work because IAPP. But i dont think so, because iphones, notebooks etc. reconnect good. Thank you so much. BR…