I have encountered a problem when using font.escapement

Text object tx_sample.font.escapement is set to 2700 on a datawindow, it is
perfectly OK when preview the design (One Page). However, when this
datawindow is pasted into a window. And during the run time, the content of
datawindows is shown on two pages, the second page is only shown on tail of
the tx_sample (Which is not shown during the design preview). Is there any
way I can remove this empty tail printed ont he second page. Please help.