<FeatureRef> cannot be sorted!

Question

i have few files let say setup.wxs, client.wxs and report.wxs. pratically, client.wxs and report.wxs each has its own <.FeatureRef Id="MainApplication"> to the main <.Feature Id="MainApplication" ...>. but the funniest thing is, i cannot sort the tree order.

let say i want:

MainApp
|- Client
|- Report

Unfortunately, it will come out the result with:

MainApp
|- Report
|- Client

unless i put these all features into the main setup.wsx without <.FeatureRef>. by this way, i can sort them as what i wanted.

can any help me on this?