On Button click change the button display text from LOCK to UNLOCK

Question

Hi Freinds,
I am rendering a TreeByNestingTableColumn with two columns  like:  Name , Status as below shown. In The status column I inserted a Table Cell editor Button type and  the button element property text mapped to the context attribute called statusButton and set the button name in the code to display as LOCK. When the tree renders all the vales are displaying in status column as LOCK. Now whrn the user click on LOCK i should fire the event and change the button text from LOCK to UNLOCK. The same way when they click on UNLOCK and i have change to LOCK. please help how to do this.
   Name                          Status
|> Employee1------------------LOCK (when i click on lock  button here, his and under neath of him button status should                 
        |>Employee2-----------LOCK    change from LOCK status to UNLOCK)                                                     
               |>Employee3----LOCK
Thanks in advance.
Thanks
Srini

Answer 1

Armin,
Yes I removed the method and created the calicualted value as you suggested and I able to get the out put what i have asked.
My complete scenario is some thing like this, i able to complete upto certain level but not able to make it work for complete scenario, I appreicate your comments or advice for getting me the below output
I have a TreeByNestingTableColum UI rendering with three columns as NAME(node |>), STATUS(Toggle Button) and PLANNING (Text view)  (developed based on sample tutorial Integration of a Tree Structure in a Web Dynpro Table.pdf)
I am trying to get this output:
From the sap backed i am getting flag value, based on that i have to render Tree UI columns NAME,  STATUS(Toggle Button) and PLANNING (Text view). if the flag is null i have to show as LOCK and In Planning else Unlock and Submitted  (please see the below picture for clear idea)*
if (statusflag = ""){
i have to show values in two columns like Lock ...Planning
} else
show values in two columns like Un Un Lock ...Submitted
One more thing is , If i lock a record at secound node level , then all the records should locked underneath of that node (it could be 2 nodes or 10 nodes) and then the status column values should change from lock to Unlock and Planning column values should change from In Planning to Submitted. where as when i Click on Unlock , only that perticular record (not node level) should changed from unlocked to Lock and planning is  from Submitted to In Planning.
This is the functionality actually I am looking for.
Here the tree sample:
Name                        Status              Planning
|>M1                         Lock                 In Planning
   |>M2                      Lock                 In Planning
     *M2a                    Lock                 In Planning
   |>M3                    Un Lock                Submittd
Thank you.
Srini