java - GWT loading elements dynamically on page load -

i have page should have dynamic count of check boxes, , inputs depends on data received database

now this:

1. make rpc call on component load (getting data inputs)
2. onsuccess add inputs dynamically on form

result: form displayed without content(because makes call async), after resizing, displays content (probably can fire resize event or redraw self, don't know how.. )

question: new in gwt, best way task? (now using gwt-ext http://gwt-ext.com/, think it's no matter )

update: refresh panel it's possible call dolayout();

i'm not familiar gwt-ext in "vanilla" gwt have 2 options:

1. refresh widget (that should show result) in onsuccess method
2. proceed rest of code not until result returned.

to bit more precise need more of code.