In the sample of Yunus, there is a nice sample included.
This one is also interesting :
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aData := { { "Name", Space(40) }, ;
{ "DOB", CToD(''), nil, nil, { || aData[ 2, 2 ] < STOD('19900101' ) } }, ; // valid
{ "Salary", 0, nil, NumPict(11,2) }, ; // picture clause
{ "State", "NY", nil, { { "NY", "NewYork" }, { "CA", "California" } } }, ; // dbcombo
{ "Married", .f. }, ; // auto checkbox
{ "Country", "USA", .f. }, ; // not editable
{ "Notes", "", nil, 'M' } } // MemoEdit
lModified := MsgGet( "EDIT VALUES", "Short Msg", aData )