enabled/disable button on click

I am using RadImage Editor and  I have a RadButton called btnSave. THis button is disabled but when user click RadImageEditor1_ToolsPanel_C_btnApply  which is the Crop's panel's Crop button, that time I want to enabled btnSave.. how can I do that?
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HainKurtConnect With a Mentor Sr. System AnalystCommented:

here they implement this:

ImageChanged event: Image Operation 'Crop' was applied to the image.

So, grab this functionality and instead of message/log put line below:

document.getElementById("<%=btnSave.ClientID%>").disabled = false;
1jawsAuthor Commented:
HainKurt, here my code and no error but Save button still disabled after crop happened

 <telerik:RadButton ID="btnSave" runat="server" Text="Save"  
        OnClientClicked="Save" onclick="btnSave_Click"  Enabled="false" > </telerik:RadButton>

function OnClientImageChanged(sender, eventArgs)
    document.getElementById("<%=btnSave.ClientID%>").disabled = false;
1jawsAuthor Commented:
by using your code HainKurt, I modify a little bit.. and now works.. jagssidurala:, your links didnt help, but thanks for the reply.
1jawsAuthor Commented:
thanks both
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