I am having the combo box and set the editable properties to true. I have around 400(approx) values to be listed. I want to give a option by typing the text, combobox listing has to list the value starting with the text typed and not the others which are not related.
You can probably use the change event of the combobox to trigger a function that evaluates what is in the textfield and then changes the population of the combobox accordingly. You will need to store your 400 items in an array such that you can search thru it to isolate the entries that get written to the combobox.
If you are not familiar with the change event, look in the help documentation under the ComboBox class section for examples.