@Override
			public void loadingStarted() {
				setStatusText("Filtering strings...");
				setCreateButtonInfo(0, 0);
				threadedTablePanel.showEmptyTableOverlay(false);
			}
For test/screen shot use

@return button
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/strings/EncodedStringsDialog.java