Allow to pass '/' for item search
diff --git a/AvailableColumnsPanel.c b/AvailableColumnsPanel.c
index feea578..8945bd2 100644
--- a/AvailableColumnsPanel.c
+++ b/AvailableColumnsPanel.c
@@ -53,7 +53,7 @@
       }
       default:
       {
-         if (0 < ch && ch < 255 && isalpha((unsigned char)ch))
+         if (0 < ch && ch < 255 && isgraph((unsigned char)ch))
             result = Panel_selectByTyping(super, ch);
          break;
       }
diff --git a/CategoriesPanel.c b/CategoriesPanel.c
index 2dc1c3b..4ee1ad4 100644
--- a/CategoriesPanel.c
+++ b/CategoriesPanel.c
@@ -87,7 +87,7 @@
          break;
       }
       default:
-         if (0 < ch && ch < 255 && isalpha((unsigned char)ch))
+         if (0 < ch && ch < 255 && isgraph((unsigned char)ch))
             result = Panel_selectByTyping(super, ch);
          if (result == BREAK_LOOP)
             result = IGNORED;
diff --git a/ColumnsPanel.c b/ColumnsPanel.c
index 63348ec..b2a8246 100644
--- a/ColumnsPanel.c
+++ b/ColumnsPanel.c
@@ -95,7 +95,7 @@
       }
       default:
       {
-         if (0 < ch && ch < 255 && isalpha((unsigned char)ch))
+         if (0 < ch && ch < 255 && isgraph((unsigned char)ch))
             result = Panel_selectByTyping(super, ch);
          if (result == BREAK_LOOP)
             result = IGNORED;
diff --git a/Panel.c b/Panel.c
index 232477b..21dfbe2 100644
--- a/Panel.c
+++ b/Panel.c
@@ -430,7 +430,7 @@
       this->eventHandlerState = xCalloc(100, sizeof(char));
    char* buffer = this->eventHandlerState;
 
-   if (0 < ch && ch < 255 && isalnum((unsigned char)ch)) {
+   if (0 < ch && ch < 255 && isgraph((unsigned char)ch)) {
       int len = strlen(buffer);
       if (!len) {
          if ('/' == ch) {