diff --git a/src/main/java/com/redhat/darcy/ui/api/elements/HasIndeterminacy.java b/src/main/java/com/redhat/darcy/ui/api/elements/HasIndeterminacy.java
new file mode 100644
index 0000000..72c848a
--- /dev/null
+++ b/src/main/java/com/redhat/darcy/ui/api/elements/HasIndeterminacy.java
@@ -0,0 +1,24 @@
+/*
+ Copyright 2014 Red Hat, Inc. and/or its affiliates.
+
+ This file is part of darcy-ui.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.redhat.darcy.ui.api.elements;
+
+public interface HasIndeterminacy {
+    boolean isIndeterminate();
+}
diff --git a/src/main/java/com/redhat/darcy/ui/api/elements/TriStateCheckbox.java b/src/main/java/com/redhat/darcy/ui/api/elements/TriStateCheckbox.java
new file mode 100644
index 0000000..e206b3b
--- /dev/null
+++ b/src/main/java/com/redhat/darcy/ui/api/elements/TriStateCheckbox.java
@@ -0,0 +1,23 @@
+/*
+ Copyright 2014 Red Hat, Inc. and/or its affiliates.
+
+ This file is part of darcy-ui.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.redhat.darcy.ui.api.elements;
+
+public interface TriStateCheckbox extends Checkbox, HasIndeterminacy {
+}
diff --git a/src/main/java/com/redhat/darcy/ui/api/elements/TriStateRadio.java b/src/main/java/com/redhat/darcy/ui/api/elements/TriStateRadio.java
new file mode 100644
index 0000000..e85b89a
--- /dev/null
+++ b/src/main/java/com/redhat/darcy/ui/api/elements/TriStateRadio.java
@@ -0,0 +1,23 @@
+/*
+ Copyright 2014 Red Hat, Inc. and/or its affiliates.
+
+ This file is part of darcy-ui.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.redhat.darcy.ui.api.elements;
+
+public interface TriStateRadio extends Radio, HasIndeterminacy {
+}