Search and replace functionality

Typical search and replace. There will be two text boxes. First one will be used for finding text in the current tab. The second will be a replacement text. Find next instance of search parameter, in the currently selected tab. Replace that instance with the string specified. Replace the currently selected text with the contents that are inside the box. If the find box does not match what is selected then the replace will not work. Find/Replace button. Perform the action of finding the next instance of what is specified in the find text box and replace it with what is contained in the replace text box.