fix #1191 master

src/main/java/tornadofx/Component.kt

@@ -75,10 +75,31 @@ class ConfigProperties(val configurable: Configurable) : Properties(), Closeable
             val value = pair.second.let {
                 (it as? JsonModel)?.toJSON()?.toString() ?: it.toString()
             }
-            set(pair.first, value)
+            setProperty(pair.first, value)
         }
     }
 
+    operator fun set(key: String, value: String) {
+        setProperty(key, value)
+    }
+
+    operator fun set(key: String, value: Boolean) {
+        setProperty(key, value.toString())
+    }
+
+    operator fun set(key: String, value: Double) {
+        setProperty(key, value.toString())
+    }
+
+    operator fun set(key: String, value: Int) {
+        setProperty(key, value.toString())
+    }
+
+    operator fun set(key: String, value: Any?) {
+        if (value == null) remove(key)
+        else setProperty(key, (value as? JsonModel)?.toJSON()?.toString() ?: value.toString())
+    }
+
     fun string(key: String): String? = getProperty(key)
     fun string(key: String, defaultValue: String): String = getProperty(key, defaultValue)
     fun boolean(key: String): Boolean? = getProperty(key)?.toBoolean()