I am working on an swing application that uses JTree component. i am using HashTable to add the elements to the JTree. The data that is to be displayed will be changing when the user clicks on NExt button. To enable this i am clearing the data in hashtable and adding the new data and readding the component to the JTree. the new data is visible only when i minimize the screen and re maximise. can any one suggest me what i should be doing. i can send the code if required.