Passing Values to a dropdown list within a dialog box

i using app.execdialog(dialog1) command display dialog box on form. dialog box contains dropdown list (popup). have found examples in examples reference loaddefaults function hardcoded values.

for example:

loaddefaults: function (dialog)
{
dialog.load(
{
subl:
{
"acrobat standard": "111",
"adobe reader": "222"
}
})
},

does know if there way pass values loaddefaults via variable etc.. can data want populate dropdown cant figure out how load control.

thanks
ken

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