Set value on a table text does not work inside a datagrid OnPageLoad event.
Let's describe a simple example:
We create a datamaster with a column "test", we add a datagrid from it.
So, in the "test" cell of the datagrid, we have an input which displays data.
Now, in the same cell, we add a label.
And still on the cell, we add a OnPageLoad which sets the label value to the input.
Therefore, in the cell, we have twice the value (from input and label).
But, if we replace the label by a Text Table, it does not work... And we have a random behavior !? Sometime, the value is displayed, sometimes not... Each time we preview the project, we have another effect...