Merge pull request micro-manager#1901 from micro-manager/fix-acq-mult…

…i-reg

Fix AcquireMultipleRegions for TileCreator change

plugins/AcquireMultipleRegions/src/main/java/org/micromanager/acquiremultipleregions/AcquireMultipleRegionsForm.java

@@ -53,7 +53,7 @@ public AcquireMultipleRegionsForm(Studio gui) {
       rlm_ = new RegionListModel();
       gui_ = gui;
       mmc_ = gui_.core();
-      tileCreator_ = new TileCreator(mmc_);
+      tileCreator_ = new TileCreator(mmc_, this.getRootPane());
       initComponents();
       currentRegion_ =
             new Region(new PositionList(), directoryText.getText(), filenameText.getText());