>How can I set readonly property to false for a particular row on a grid which is readonly?
Smitha,
If you want to change ReadOnly status depending on field value (say, if myNumber>100 you want ReadOnly=.f., otherwise .t.) you can put in Grid Init:
this.ColumnMyNumber.Readonly=(myNumber<=100)
And you probably should Refresh your grid in AfterRowColChange (for me it doesn't work without refreshing).
If it's not broken, fix it until it is.
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