how to config kindle system Xdialog( or xmessage) font size?

I am working on my kinde app project, I need call kindle linux system native xdialog or xmessage , it works, a window pop up, but font of xdialog is very very small, and buttons on xdialog are also very small, is there any way to change kinde linux system native xdialog font size?:smack:


BTW, kindle is using XDM or GDM or KDM or something else? I can not find config file of linux native xdialog window on kindle