How do I initially populate the WebDynpro table associated with the BAPI?

I am new to webdynpro abap and have the following problem: I created a service that returns a set of all existing clients. This function works well if I test it in a litte program by just printing out the lines.

now i have created a webdynpro containing a table to display these clients. I also made a binding! And it works, but only if the event triggers the execute function ...

I need something like "execute initially" means that the function is executed when the table is initially loaded.

How can i do this?