How to clear a drop down by key on a button action

Hi All
        I am new to the webdynpro i have to clear the dropdown by key, i had tired giving the
                wdContext.nodeA().invalidate();
             on a button action which will navigate to next view after click but it doesn't effect when i come back to the first view can any one help me in doing this.
Regards
Ashwin

Hi Ashwin,
To display the values in DropDownbyKey, yuo need to populate the value in the node before the view is rendered to the user. So must be populating the node in the wddoinit method the view controller or the component controller.
Now just for your knowlegde, DropDownbyKey just holds the one value which is selected by the user, and all other values are automatically invalidated by the framework. So invalidate methos is a wrong choice in this case. You can probably use the function module SET_STATIC_ATTRIBUTES_NULL for a element. For further info you can check IF_WD_CONTEXT_ELEMENT in se24 transaction.
Hope this help.
Cheers !
Ashish

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i m using drop down by key (Combo box) ..
i have populated some values in that ..
then i navigate to next view ... from that view i m again navigating back to the
previous view .. now the values which was filled needs to be cleared ..
i used invalidete method also even though the values are present in the list ..
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There are many tutorials on SCN for learning Web Dynpro ABAP. If the following steps don't make sense to you, please do a search for some tutorials and read through the tutorial materials. Hopefully the tutorials will help you to become familiar with some of the basics of Web Dynpro ABAP.
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Hi,
Explaining my problem with an example.
There is a hotel table where user enter hotel details
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