Silverlight Control property as a data binding Source and View-Model property as target -

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i have property on silverlight control viewmodel wants bind to. viewmodel need told of changes property not other way around

syntax 

<mycontrol viewport="{binding vmproperty}"/>

declares viewport target, in instance viewport source of data. know make twoway binding seems wrong when want 1 way in other direction.

besides not want make property on control dependencyproperty because not want property settable , not beleive silverlight supports read dependency properties.

is there different way of setting binding?

tia

pat long

maybe works? http://forums.silverlight.net/forums/p/141042/315359.aspx#315359

{binding elementname=textbox1, path=text, mode=twoway ,updatesourcetrigger=explicit}


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