How to pass a value into DataSource

[shuangg]

Default
I am using SmartGWT 2.2

I could like pass a value, say, 10 into a DataSource
Should I do
DataSource ds = ${Some datasource}
ds.setAttribute("targetID", 10, ${allowPostCreate}); (btw, should allowPostCreate here be set to true false?)
Or
DSRequest dsr = new DSRequest();
dsr.setAttribute("targetId", 10);
ds.setRequestProperties(dsr);

Both work, but I am not sure which one is the recommended style.

Thanks in advance
Sean

[sjivan]

Edit : You can use the first method and pass true for the allowPostCreate for custom attributes.

[shuangg]

Thanks, in which case should the second way be used?
Sean