well, I solved my problem. The code is not as short as I expected, but is still
much shorter than `Layout DSL` version. the main changes lies in 2 parts:
btw, we can't use V:|-[file2(sheet2,cr2)]-[sheet2]-[cr2]-|
1. seperate the discription
2. use `Explicit Constraint Syntax`
outer: staticbox2
H:|-{file2:[textFile2(btnFile2*5)]-[btnFile2]}-|
H:|-{sheet2:[lblSheet2(cboxSheet2/5)]-[cboxSheet2]}-|
H:|-{cr2:[lblCol2(txtCol2,lblStartRow2,txtStartRow2,lblEndRow2,txtEndRow2)]-[txtCol2]-[lblStartRow2]-[txtStartRow2]-[lblEndRow2]-[txtEndRow2]}-|
V:|-[file2]-[sheet2]-[cr2]-|
C: textFile2.height = lblSheet2.height
C: lblSheet2.height = lblCol2.height
Run
